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<A href="introduction6.htm">Debugging Tools for Windows (WinDbg, KD, CDB, NTSD)</A> &gt; <A href="debugger_reference.htm">Debugger Reference</A> &gt; <A href="debugger_commands.htm">Debugger Commands</A> &gt; <A href="kernel_mode_extensions.htm">Kernel-Mode Extension Commands</A> &gt; </div>
	<div id="winchm_template_title">!ihs</div>
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	<div id="winchm_template_content"><div id="mainSection"><p>The <b>!ihs</b> extension displays the interrupt history record for the specified processor, using program counter symbols. </p>
<pre class="syntax"><b>!ihs </b><i>Processor</i> </pre>
<div class="alert"><b>Important</b>  This command has been deprecated  in the Windows Debugger Version 10.0.14257 and later, and is no longer available.</div>
<div> </div>
<h2><a id="Parameters"></a><a id="parameters"></a><a id="PARAMETERS"></a>Parameters</h2>
<p></p>
<dl>
<dt><a id="_______Processor______"></a><a id="_______processor______"></a><a id="_______PROCESSOR______"></a>       <i>Processor</i>      </dt>
<dd>
<p>Specifies a processor. If <i>Processor</i> is omitted, the current processor is used.</p>
</dd>
</dl>
<h3><a id="DLL"></a><a id="dll"></a>DLL</h3>
<table>
<tr>
<td>
<p><b>
          Windows 2000
         </b></p>
</td>
<td>
<p>Unavailable</p>
</td>
</tr>
<tr>
<td>
<p><b>
          Windows XP and later
         </b></p>
</td>
<td>
<p>
          Kdexts.dll
         </p>
</td>
</tr>
</table>
<p> </p>
<p>This extension command can only be used with an Itanium target computer.</p>
<h2>Remarks</h2>
<p>To display the interrupt history record without using program counter symbols, use the <a href="#Bookmark2359"><b>!ih</b></a> extension. To enable the interrupt history record, add <b>/configflag=32</b> to the boot entry options.</p>
<p>Here is an example of the output from this extension:</p>
<pre class="syntax" xml:space="preserve"><code>kd&gt; !ihs
Total # of interruptions = 2093185
Vector              IIP                   IPSR          ExtraField            IIP Symbol
        VHPT FAULT  e0000000830d3190      1010092a6018  IFA=      6fc00a0200c nt!MiAgeAndEstimateAvailableInWorkingSet+0x70
        VHPT FAULT  e0000000830d33d0      1010092a6018  IFA= 1ffffe00001de2d0 nt!MiAgeAndEstimateAvailableInWorkingSet+0x2b0
        VHPT FAULT  e0000000830d33d0      1010092a6018  IFA= 1ffffe01befff338 nt!MiAgeAndEstimateAvailableInWorkingSet+0x2b0
        VHPT FAULT  e0000000830d3190      1010092a6018  IFA=      6fc00a0200c nt!MiAgeAndEstimateAvailableInWorkingSet+0x70
        VHPT FAULT  e0000000830d33d0      1010092a6018  IFA= 1ffffe00001d9188 nt!MiAgeAndEstimateAvailableInWorkingSet+0x2b0
        VHPT FAULT  e0000000830d3880      1010092a6018  IFA= 1ffffe01befff250 nt!MiAgeAndEstimateAvailableInWorkingSet+0x760
        VHPT FAULT  e0000000830d3fb0      1010092a6018  IFA= e0000165f82dc1c0 nt!MiCheckAndSetSystemTrimCriteria+0x190
        VHPT FAULT  e000000083063390      1010092a6018  IFA= e0000000fffe0018 nt!KeQuerySystemTime+0x30
     THREAD SWITCH  e000000085896040  e00000008588c040  OSP= e0000165f82dbd40 
        VHPT FAULT  e00000008329b130      1210092a6018  IFA= e0000165f7edaf30 nt!IopProcessWorkItem+0x30
 VHPT FAULT  e0000165f7eda640      1210092a6018  IFA= e0000165fff968a9 netbios!RunTimerForLana+0x60
    PROCESS SWITCH  e0000000818bbe10  e000000085896040  OSP= e0000165f8281de0 
        VHPT FAULT  e00000008307cfc0      1010092a2018  IFA= e00000008189fe50 nt!SwapFromIdle+0x1e0
EXTERNAL INTERRUPT  e0000000830623b0      1010092a6018  IVR=               d0 nt!Kil_TopOfIdleLoop
        VHPT FAULT  e00000008314e310      1010092a2018  IFA= e0000165f88203f0 nt!KdReceivePacket+0x10
        VHPT FAULT  e000000083580760      1010092a2018  IFA= e0000000f00ff3fd hal!READ_PORT_UCHAR+0x80
    PROCESS SWITCH  e00000008558c990  e0000000818bbe10  OSP= e00000008189fe20 
        VHPT FAULT  e00000008307cfc0      1010092a2018  IFA= e0000165f02433f0 nt!SwapFromIdle+0x1e0
        VHPT FAULT          77cfbda0      1013082a6018  IFA=         77cfbda0 0x0000000077cfbda0
        VHPT FAULT          77cfbdb0      1213082a6018  IFA=      6fbfee0ff98 0x0000000077cfbdb0
 DATA ACCESS BIT          77b8e150      1213082a6018  IFA=         77c16ab8 0x0000000077b8e150
 VHPT FAULT          77ed5d60      1013082a6018  IFA=      6fbfffa6048 0x0000000077ed5d60
   DATA ACCESS BIT          77ed5d60      1213082a6018  IFA=         77c229c0 0x0000000077ed5d60
 DATA ACCESS BIT          77b8e1b0      1013082a6018  IFA=         77c1c320 0x0000000077b8e1b0
      USER SYSCALL          77cafa40        10082a6018  Num=               42 0x0000000077cafa40
 VHPT FAULT  e00000008344dc20      1010092a6018  IFA= e000010600703784 nt!ExpLookupHandleTableEntry+0x20
...</code></pre></div></div>	
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